We often talk about cancer as being a disease caused by mistakes in DNA – the genetic instructions inside all our cells that tell them to make molecules such as proteins. And faulty genes do indeed cause cells to grow out of control, leading to cancer. But it isn’t just the sequence of the DNA that matters, but also how it’s used that’s important.

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Cancer Research UK is a registered charity in England and Wales (1089464), Scotland (SC041666) and the Isle of Man (1103). A company limited by guarantee. Registered company in England and Wales (4325234) and the Isle of Man (5713F). Registered address: Angel Building, 407 St John Street, London EC1V 4AD.